Heat 2 tablespoons oil over medium-high heat in a large Dutch oven/soup pot. Season chicken with 1/2 teaspoon salt and 1/2 teaspoon pepper then sear until golden, about 2 minutes per side. Remove to a plate but leave drippings.: You will notice the oil shimmer when it is properly hot and ready, that visible ripple is your indicator to add seasoned chicken ; the sizzling when the meat hits the surface should be immediate and energetic which means you are forming a golden crust; this crust creates those brown bits, fond, that add deep savory flavor to the base of the soup as they dissolve into the liquid; a common mistake is starting with a pan that is not hot enough, which leads to pale, steamed chicken instead of a flavorful sear.
Melt 3 tablespoons butter with 1 tablespoon olive oil over medium low heat. Once melted, increase to medium-high heat and add onions, carrots and celery; sauté for 4 minutes scraping up the golden bits on the bottom of the pan. Add garlic and sauté for 30 seconds; sprinkle in flour then cook, stirring constantly for 2 minutes (it will be thick).: As you sear, watch for a deep golden color rather than a quick dark burn, the sound should be a steady sizzle and your spatula should release the meat easily when the crust is ready; searing seals juices and builds taste that becomes part of the broth; avoid the pitfall of crowding the pot which cools the surface and causes steaming instead of browning.
Add chicken back to the pot along with rice, bouillon, all seasonings, 3/4 teaspoon salt, bay leaf and chicken broth. Cover the soup to bring to a simmer, then displace the lid so it’s partially covering the pot, with about a one-inch opening. Simmer the soup for 12-15 minutes or until chicken is tender enough to shred.: Leaving the flavorful drippings in the pot is intentional, they will be the foundation for the sauté and eventual broth; you should see a thin browned film and aromatic flavor clinging to the bottom, that is what you want to transfer into the vegetable stage; a common error is discarding these drippings which loses a lot of depth.
Remove chicken to a cutting board and shred into bite-size pieces once cool enough to handle (don’t add back to soup yet). Continue to simmer the soup for an additional 10 minutes, partially covered.: The butter should melt gently into the oil, producing a glossy surface and a faint nutty aroma, keeping heat at medium low prevents burning while allowing the fat to coat the vegetables; too high a heat will darken the butter and introduce bitter notes.
After 10 minutes, whisk cornstarch with half and half (you can whisk with as little as 1/2 cup, just enough so it dissolves) and add to pot. Continue to simmer the soup uncovered for an additional 10-20 minutes or until the rice is almost al dente, stirring often.: As you sauté the mirepoix, listen for a lively but controlled sizzle, you want the vegetables to soften and begin to color without collapsing; the act of scraping those browned bits integrates concentrated flavor into the vegetables; a mistake is rushing this step which results in underdeveloped flavor.
Stir in shredded chicken (or rotisserie chicken if using), and cauliflower and continue to simmer for 5 minutes or until cauliflower is tender and rice is al dente. Add peas and warm through, 1-2 minutes. Stir in additional broth or half and half if desired for a less “chunky” soup. Taste and season with additional salt and pepper if desired (I like more salt).: The garlic will release a fragrant aroma quickly, and then stirring in the flour creates a roux that thickens the broth; you will smell the rawness of flour disappear as it cooks, and the mixture should smell toasty and look cohesive; do not skip cooking the flour or you will taste raw starch.
Add chicken back to the pot along with rice, bouillon, all seasonings, 3/4 teaspoon salt, bay leaf and chicken broth: When the pot returns to the stove with the chicken , you are building the simmering stew, and the broth should take on a deeper color as it picks up those seasoned bits; stirring briefly to combine ensures the wild rice starts hydrating evenly; a common mistake is not dissolving bouillon well which creates salty pockets.
Cover the soup to bring to a simmer, then displace the lid so it’s partially covering the pot, with about a one-inch opening: The gentle leak of steam from the one-inch gap stabilizes a simmer and prevents boil over while allowing flavors to reduce slightly; the surface should show gentle movement and occasional small bubbles, which is ideal for even cooking; avoid a rolling boil, it will make the chicken tough and the liquid reduce too quickly.
Simmer the soup for 12 to 15 minutes or until chicken is tender enough to shred: During this simmer you will start to smell a richer, deeper aroma as the broth concentrates, and the chicken should feel tender when pierced with a fork; testing for doneness avoids shredding meat that is still firm; overcooking here can cause dry shreds later.
Remove chicken to a cutting board and shred into bite-size pieces once cool enough to handle (don’t add back to soup yet): Shredding while the chicken is warm makes it easier to pull into tender ribbons, and separating it from the pot at this stage prevents small shreds from overcooking in the coming simmer; the texture should be moist and juicy; a mistake is shredding too finely which can vanish into the broth.
Continue to simmer the soup for an additional 10 minutes, partially covered: This extra simmer allows the wild rice to swell and absorb savory flavors while the broth reduces slightly, you will see grains plump and the aroma deepen; stirring occasionally prevents sticking; leaving the pot unattended risks the rice sticking to the bottom.
After 10 minutes, whisk cornstarch with half and half and add to pot: Whisking the cornstarch into the half and half until smooth prevents lumps and yields a glossy, slightly thickened broth; once added, the soup should thicken gradually and gain a silky coating on the back of a spoon; common error: adding cold slurry to a boiling pot which can shock and clump the starch.
Continue to simmer the soup uncovered for an additional 10 to 20 minutes or until the rice is almost al dente, stirring often: As the liquid reduces, watch for the rice to become tender but still with a little bite, this will produce the ideal mouthfeel after you add the vegetables and shredded chicken ; frequent stirring prevents the bottom from scorching; the mistake to watch for is letting the rice go mushy from overcooking.
Stir in shredded chicken, and cauliflower and continue to simmer for 5 minutes or until cauliflower is tender and rice is al dente: Adding the shredded chicken back now allows it to warm through without becoming dry, the cauliflower will release a mild, slightly sweet scent and should be tender but intact after this brief simmer; overcooking the cauliflower will make it limp and grainy.
Add peas and warm through, 1 to 2 minutes: When you stir in the thawed peas , their bright green color and sweet aroma will revive the pot; they need only a minute or two to heat, which preserves texture and vibrancy; a common mistake is leaving them in too long until they lose color and become mealy.
Stir in additional broth or half and half if desired for a less “chunky” soup: Adjusting consistency at the end is a personal choice, adding a splash of warmed broth or more half and half loosens the body without diluting flavor too much; taste after each addition to keep balance; avoid adding cold liquid straight from the fridge which shocks the soup.
Taste and season with additional salt and pepper if desired: Final seasoning is critical because the flavors have concentrated, taste a spoonful and add small increments of salt or pepper to finish; this step tailors the soup to your palate; the common mistake is over-salting in one go instead of adjusting incrementally.